Door-bolt



UNITED STATES PATENT oFFIcE.

DOOR-BOLT.

Speeiication of Letters Patent.

',.Application led December 9, 1918. Serial No. 265,976.

To all whom t may concern.'

Be it known that I, ARTHUR H. Mo'rfr, a subject of the King of Great Britain, residing .at `WinstonSalern, in the county of Forsyth and State of North Carolina, have invented new and useful Tmprovements in Door-l3olts, of which the following 1s a specification. K

This invention relates to new and useful improvements in doors and the principal object of the invention is to provide means for automatically withdrawing the locking bolt of the door by the weight of a person attempting to pass Vthrough the; doorway in one direction.

The invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claim. In describing my invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which a Figure l is an elevation of the' invention.' Fig. 2 is a transverse section. Fig. 3 is an enlarged view of the locking means.

The invention is' mo-re particularly adapted for swinging doors used in serve self stores7 moving picture theaters and the like, where a door is required at the entrance or eXit which will admitl of passa-ge in but one direction.

Tn the drawings, l indicates the swinging door and 2 the jam. 3 indicates a lock casing located in the jam, and containing the bolt et sliding in the guides 5 and held in. projected positionlby the spring 6. 7 indicates a bell crank lever pivoted in the casing and having its pawl shaped end engagingwith the rear rounded end of said bolt. If desired the bolt may be secured to said end by means of a link 8. Theother part of the lever is provided with a slot 9 andV a link 10 has one endl engaging said slot and its other end connected to a rod 1l carried by.

the movable platform 12. This movable platform forms part of the floor in front of the door, and said vplatform has its end farthest froml said door secured to a shaft 13 which is journaled in suitable bearings secured to the floor. Springs 14; under the platform hold the same in its uppermost position and platesl secured to the floor Patent-ea May 3, 192,1.

and projecting into the path of movement of said platform prevent the same from rising' above the level of the floor.

It will thus be seen that when a person steps on the platform his weight will overcome the springs so that the platform'will be lowered. This movement of the platform will rock the bell crank lever so as to retract the bolt from the keeper on the door So as to permit the door to swing open. 1When the persen passes through the doorway the springs will return the platform to normal position and the bolt will be forced into projecting position. Thus when the*v door swings shut 1t will'be engaged and locked by the bolt. Inthis way a person can pass through the doorway from one direction only.

It is thought from the foregoing description that the advantages and novel featuresof my invention will beV readily apparent. I desire it to be understood that Iv may make changes in the construction and in the combination and arrangement of the several parts, provided that such changes fall with-A in the scope of the appended claim.

I yclaim as my invention In combination with a' swinging door and a spring controlled locking bolt therefor, a hinged platform located adjacent said door,

a stationary plate secured to the floor and arranged to engage the platform to limit the upward movement of the same, a spring' under the platform for normally holding the same against the plate,v a bell crank lever mounted'in 5the bolt casing and having one arm connected to the bolt anda slot inits other Varm and `a link connected with' the Vplatform and its other end engaging said In testimony whereof I aiiX my signature.

ARTHUR H. Mor'r. 

